\begin{tikzpicture}[scale=.8]
    \pgfmathsetmacro{\R}{1.5}
    \pgfmathsetmacro{\r}{1.2}

    \tkzDefPoints{0/0/O_1, -2.3/0/O_2}
    \tkzDefPoint(60:\R){M}
    \tkzDefShiftPoint[O_2](60:\r){N}
    \tkzInterCC(O_1,M)(O_2,N)  \tkzGetPoints{B}{A}

    \tkzDrawCircle[thick](O_1,M)
    \tkzDrawCircle[thick](O_2,N)
    \tkzDrawSegments(O_1,M  O_2,N  O_1,O_2)
    \tkzLabelSegment[midway, left](O_1,M){$R$}
    \tkzLabelSegment[midway, left](O_2,N){$r$}
    \tkzLabelPoints[right](O_1)
    \tkzLabelPoints[left](O_2)
    \tkzLabelPoints[above=.5em](A)
    \tkzLabelPoints[below=.5em](B)
\end{tikzpicture}

